[DeTomaso] 2V heads

[cengles at cox.net]

Dear Donny and Charlie,

My experience with Aussie heads:

First engine with aussie heads was notably better than the stock 8.66:1 CR 351C 4V engine. It had an Edelbrock 2V Performer intake and an unknown cam. It *really* wheezed at about 5300 rpm. [283 hp dyno]

Second engine with Aussie heads was built with a Weiand Xclerator 2V intake plus an appropriate Comp Cams cam. Big improvement. Dyno testing shows that its power curve goes up to about 6200 rpm before dropping off. Seat-of-the-pants dyno confirms that it is a whole different street engine than the first one. [401 hp dyno]

Third engine with 4V heads, porting, Strip Dominator intake and custom cam appropriate for the head flow numbers is certainly a more potent unit than the second Aussie. [445 hp dyno] I am rebuilding it (don't ask) and plan on doing another 4V motor with a Funnel web and more port work plus hydraulic rollers. [ 475+??]

If built properly, the aussies will work and breathe above 5500 rpms, but for the bigger bang then go with a properly built 4V.

Still foolin' with engines, Chuck Engles



---- Donny Williams <donnylee at ccwebster.net> wrote:
>The only thing a bit better is closed Chamber qeunch 4 V head being rock and
>rolled by a solid roller cam willing and ready to spin 7500 RPM. There is
>nothing more beauiful then that sound! It really is quite immaculate!! And
>so is pull your bag off power from a rolling 3400-7500 RPM. My old iron
>worked over CC heads flow 320 CFM at 600 Lift......What more would one need
>from a head on the tiny 351C bore/stroke?
>
>The Aussie 2Vs may make a good bit of low end, trouble is they really are
>out of breath at 5500 RPM flat on their face with any cam. You can never
>make a 351 act like a big block, never......why try? Its endevour with mild
>marginal returns in my opinion, unless you use a walker with tennis balls on
>the bottom. An Aussie headed 351C is a great engine for grand papa with
>marginal Hydro Cam. 351 C's are capable of making just an awesome amount
>of top end power. I had mine built and ready for a 200 HP shot of
>nitrous......My build left me asking what was I thinking? 1st thru 3rd is
>good for 133MPH and a not bad real quickly to get there! I actively race a
>mid 10 second bracket car. I am damn certain my Pantera is at least as good
>for high 11 seconds in the quarter.....
>
>Pantera's are road cars...you get me on a roll chances are high I am going
>to chew someones @** and wreck someones day. That does not mean I am billy
>bad-@** but I am really confident I can chew up 98.5% of anything out in
>Oregon with a licence plate New/Old without the laughing gas I originally
>planned, in need to prove it contest..........With the 200 shot of gas good
>lord! All bets are on!
>
>At the end of the day I race 462 big cubes with wheels in the air at
>launch......But this little old Ford motor has a top end that is way cool up
>top with the Iron 4vs and the aggressive solid!
>
>To coin Nancy Reagon..........Just say no to Aussies! I gueess I am saying
>from this view they are just not for me, or what I want from my
>351C.............Find a set of CC 4Vs call Crower for the roller and the
>Engine behavior of your dreams, and you will never look back at Australia.
>
>
>----- Original Message -----
>From: "Charles McCall" <charlesmccall at gmail.com>
>To: "'mark skwarek'" <ehpantera at yahoo.com>; <detomaso at realbig.com>
>Sent: Thursday, January 11, 2007 12:37 AM
>Subject: RE: [DeTomaso] 2V heads
>
>
>>One advantage (assuming it's used correctly) is that the closed chamber
>>heads, having a much smaller combustion chamber than the open chamber,
>>will
>>boost your compression ratio significantly. Not excessively, but
>>significantly. That alone will give you a little more oomph.
>>
>>I changed a whole bunch of things all at the same time so I can't tell you
>>what the effect of the quench chamber heads would be alone. My engine will
>>rev happily and is still pulling strong when the rev limiter kicks in at
>>6500rpm. It would rev higher without that chip but I want the engine to
>>live. I don't believe that the rpms are due to the heads, but instead the
>>intake, cam, etc...
>>
>>Charles McCall
>>1985 DeTomaso Pantera GT5-S #9375
>>"Raising Pantera Awareness across Europe"
>>http://members.aol.com/PanteraGT5S1985/
>>
>>
>>-----Mensaje original-----
>>De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
>>nombre de mark skwarek
>>Enviado el: Thursday, 11 January, 2007 12:50 AM
>>Para: detomaso at realbig.com
>>Asunto: [DeTomaso] 2V heads
>>
>>Does anyone have any experience with the Aussie closed chamber 2V heads?
>>What RPM are they good to? Is there much improvement over 4V heads in a
>>stock '73 engine.
>>Thanks
>>Mark
>>
>>
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